The second reference has a section near the beginning that defines oil terms that is especially useful. Later it has oil recommendations that are good reading, although not everyone will agree with all of them.

Erich

The above is certainly interesting. Perhaps we should more closely define our application, as in my case, and maybe others, using an automotive engine vs. a traditional aircraft engine.

I have read reports from pilots here (and on other forums) using synthetic oil with an automotive engine in the aircraft, and burning 100LL exclusively with zero problems.